Understanding Monohybrid Cross: Black vs White Hair in Mice

Explanation:

In this monohybrid cross, where black hair is dominant to white hair in mice, we'll cross a heterozygous black mouse (Bb) with a white mouse (bb).

To determine the genotypic and phenotypic ratios of the offspring, we'll use Punnett square analysis:

Punnett Square:
b | Bb | bb |
Genotypic Ratio:

The genotypic ratio represents the possible combinations of alleles in the offspring.

From the Punnett square, we have:
1 Bb (heterozygous black) and 1 bb (white)
Therefore, the genotypic ratio is:
1:1 or 1 Bb: 1 bb

Phenotypic Ratio:

The phenotypic ratio represents the observable traits in the offspring.

From the genotypic ratio, we can infer that:
1 offspring will have black hair (Bb)
1 offspring will have white hair (bb)
Therefore, the phenotypic ratio is:
1:1 or 1 Black hair: 1 White hair

In summary, the genotypic ratio of the offspring is 1 Bb: 1 bb, and the phenotypic ratio is 1 Black hair: 1 White hair.